1. Center for Visual Science, University of Rochester, Rochester, New York
2. Flaum Eye Institute, University of Rochester, Rochester, New York
3. Department of Ophthalmology and Visual Sciences, Carver College of Medicine, Iowa City, Iowa4Stephen A. Wynn Institute for Vision Research, University of Iowa, Iowa City5Howard Hughes Medical Institute, University of Iowa, Iowa City
4. Center for Visual Science, University of Rochester, Rochester, New York6The Institute of Optics, University of Rochester, Rochester, New York
5. Center for Visual Science, University of Rochester, Rochester, New York2Flaum Eye Institute, University of Rochester, Rochester, New York